If a product is designed for use in a tank mix, it will sometimes say so on the label or packaging. The label may suggest other compatible products that can be mixed together, for example, when a herbicide is safe to mix with an insecticide to manage two types of pest at the same time.
The label may also advise on products that should not be mixed together, or should not be mixed with other products at all. Information about mixing the product safely may also be included on the products’ safety data sheets (SDSs).
Note: even if there isn’t information about mixing with other products or chemicals on the label, packaging or on the SDS, it doesn’t necessarily mean that the product is safe to mix.
The main aim is to work safely, to ensure the products are compatible and can be mixed safely. So if the information isn’t available on the product labelling and SDSs, we recommend that you do some research first before mixing and spraying. Ask your supplier, or the product importer or manufacturer, as they should hold more information about safe use of products, and which are known to be compatible. Rural suppliers often have in-house consultants who can advise.
Any use of products containing hazardous chemicals must meet the restrictions (or ‘controls’) that were put in place when they were approved for use in New Zealand. For tank mixes, you will need to consider the controls for all of the products in the mix – noting that these individual controls may be inadequate to manage any unforeseen consequences of the combination of chemicals in your tank mix.
To find out the controls for an approved product or ingredient in the EPA's Controls database